Yes, I have traveled through southern Oregon. The area from about Roseburg to Eugene is very temperate with the same hardwood trees growing naturally that I see in the Carolinas. You stand a good chance of repeating my results.

Most of the avocados I got from "ANaturalFarm" in Howey-in-the-Hills Florida, near Orlando. When in the area, I also check out Green's Nursery and Pokey's (OrlandoPlantsAndTrees) in Zellwood, northwest of Orlando.

It was part of my premise at the beginning that the retaining wall (concrete paver stones) could provide a thermal mass effect, although during winter they feel quite cool to the touch. It's hard to be sure. I needed to do this for another important reason too though, which is my native soil is heavily clay based. It's almost as if the trees are still in containers, but as you described, sitting in wells of good soil. You're right that I may likely need to shape the tree some this winter to fit it comfortably under a cover.

Is it a grafted avocado?

Yes it is

@@roopmatieramkissoon1076 very strange. I planted a new lila this spring and it immediately exploded with flowers. Something doesn't sound right.

I am thinking of giving it bearing salt soon, never did

@@roopmatieramkissoon1076 let us know how that works for you. I have considered the same for my lemon tree

My recollection is that MG's tree dropped fruit the first two years, and it held a fruit at the end of its third year in ground. I think there probably is some soil difference. I use a generous proportion of Daddy Pete's sandy loam, which I can find at Southern States versus the usual big box stores. Lots of plants grow well in it, not just avocados.

@@Avo7bProject I saw in his most recent post that he is got a new tree due to its constant dropping of fruit. Seems the issue is still there. I planted the same tree in the ground in North Texas this spring and its doing fantastic but I'm looking at what your doing and clearly something is working better for you. - follow up.. looks like he just posted an hour ago and he has a bunch growing strong this year. Seems it just needed to mature a bit. Still interesting to me how yours is holding them this well in your second year.

One difference in Germany is that the sun will be at a lower angle in the sky, so you could have a shorter growing season than here. There is an example of a mature tree growing in London, but the climate there is more oceanic and rarely below freezing. The best I can say is that if you make an attempt, mimic the techniques that I and Millennial Gardener have used. Keep the tree close to a south facing wall, give it the proper loose soil, and be prepared to cover it when you get ice or snow.

@@Avo7bProject ok. Thanks.